The operational amplifier of this circuit can be the 741. The circuit has very low consumption and can be powered by two 9-B batteries. Low voltage amplifiers can be used.
This circuit provides a signal that is twice the frequency of the input signal. The circuit was...
This unusual amplifier configuration is from 1986. The circuit has a high resting current given the...
This circuit is from an 80's American documentation. The circuit uses components of the time which...